Provided is an elastic wave device in which a piezoelectric substrate does not readily warp, and characteristics do not readily deteriorate. This elastic wave device 1 is provided with: a support substrate 2; an acoustic multilayer film 3 provided on the support substrate 2; a piezoelectric substrate 4 provided on the acoustic multilayer film 3; and an IDT electrode 5 provided on the piezoelectricsubstrate 4. The absolute value of the thermal expansion coefficient of the piezoelectric substrate 4 is greater than the absolute value of the thermal expansion coefficient of the support substrate2. The acoustic multilayer film 3 is provided with at least four acoustic impedance layers. A bonding layer is further provided which is provided in any position from the centre of the first acousticimpedance layer 3g from the piezoelectric substrate 4 side to the support substrate 2 side, to the interface between the third acoustic impedance layer 3e and the fourth acoustic impedance layer 3d.